M-EPI / M-PRION / M-ECO: Three Cross-Domain Nucleation Model Cards with Self-Contained Scripts

Three theory-neutral operational model cards instantiating one cross-domain nucleation skeleton (five elements, three readout layers, two-force-ratio threshold) in three independent domains: M-EPI (epidemic establishment: SIR, herd threshold, final-size equation), M-PRION (templated protein aggregation: conversion-clearance criterion, exact log-dose incubation linearity), M-ECO (population colonization: strong Allee bistability, colonization-time closed form). Each card carries pre-registered criteria, negative-result clauses, and a numpy-only self-contained script with embedded self-tests. Companion to 'Nucleation as a Cross-Domain Structure' (v1.1, DOI 10.5281/zenodo.23617710); same delivery form as the NMC model card v0.4.